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Pinhole optic vs dust

Hello, I bought Pinhole/Zone Plate optic for my Composer and I have a little problem. I can see every single piece of dust on pictures taken with it (probably because of huge aperture). I clean sensor in my camera quite often and there is no dust on pictures taken with normal lenses, but with Pinhole optic it's terrible... Can you help me?

i dropped mine in the sand at the park with my kids, theres a few annoying pieces but i just use the clone stamp in photoshop to take care of it, its extra work but i've even tried cleaning it with an air compressor with no help.

Banana Joe,"compressed air" dont always mean air compressors,there is some kind of spray cans,made for camera cleaning.
Using an industrial piston compressor is unwise,as the air from these often contains small drops of water or compressor lubricant.

I live very close to Canon and take mine in every couple of months for sensor cleaning. Still, when using that Pinhole, I saw so much dust. I like the idea of adding texture too. It's easier than trying to fix all the spots.